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Convention for the Exemption of Hospital Ships, in Time of War, from The Payment of all Dues and Taxes Imposed for the Benefit of the State. The Hague, 21 December 1904.
Art. 5. The non-Signatory Powers are permitted to adhere to the present Convention after 1 October 1905.
They shall, to that end, make their adhesion known to the Contracting Powers by means of a written notification addressed to the Government of the Netherlands and communicated by the latter to the other Contracting Powers.